The proposed PhD is taking place in the general context of the development of hydrogen-powered electric vehicles and more specifically aims to improve the tools for modelling and characterizing polymer membranes used in Proton Exchange Membrane Fuel Cells (PEMFC). In this fuel cell technology, in addition to the anode and the cathode, which are the sites of the oxidation of hydrogen and the reduction of oxygen respectively, there is a solid electrolyte made up of a cation-conducting polymer which transfers hydrated protons between the two compartments of the cell.
Applied Physico-chemistry and Mechanics
To support the development of electricity production from wind power, IFP Energies nouvelles is involved in the energy transition as a research and training player, especially in emerging technologies such as floating offshore wind turbines (FOWT).
Cost reduction strategies for wind energy are leading to the development of increasingly large wind turbines (today nearly 300m for the tallest), located in offshore environments with favorable wind conditions. Compared to smaller models, the blades of these large rotors deform significantly, especially when facing extreme events (high winds, emergency stops). Aeroelastic coupling effects are therefore becoming increasingly critical.
Emulsions are systems present in many industrial processes and products. Their stability depends on the density difference between the dispersed and continuous phases and on their rheology (creaming or sedimentation), on the interactions between the drops (coalescence) and on their polydispersity (Oswald ripening). The interactions between the drops are notably governed by the value of the interfacial tension (IFT) and by the kinetics of diffusion and adsorption of the surfactants at the interfaces.
Lithium ion batteries are today the most realistic solution to answer the ever-increasing demand for electrochemical energy storage devices. The two main requirements for such systems are a higher gravimetric capacity and an increased safety, both can be solved using a solid electrolyte instead of the liquid ones in the current technology. At present time three main groups of solid electrolytes exist: polymers, inorganic materials, and hybrid materials (a mixture of an inorganic and an organic phase).
Recycling plastic materials is essential for reducing the amount of waste, but currently used mechanical recycling processes have very important limitations (sorting control, color). Chemical recycling will allow a more complete material recovery and this PhD thesis aims at contributing to its development. For the solvent dissolution processes, it is essential to model the polymer blend + solvent mixtures so as to identify the limits of solubility.